/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file creator/creator_args.c
 *  \ingroup creator
 */

#ifndef WITH_PYTHON_MODULE

#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "MEM_guardedalloc.h"

#include "CLG_log.h"

#ifdef WIN32
#  include "BLI_winstuff.h"
#endif

#include "BLI_args.h"
#include "BLI_threads.h"
#include "BLI_utildefines.h"
#include "BLI_listbase.h"
#include "BLI_string.h"
#include "BLI_string_utf8.h"
#include "BLI_path_util.h"
#include "BLI_fileops.h"
#include "BLI_mempool.h"
#include "BLI_system.h"

#include "BLO_readfile.h"  /* only for BLO_has_bfile_extension */

#include "BKE_blender_version.h"
#include "BKE_context.h"

#include "BKE_global.h"
#include "BKE_image.h"
#include "BKE_library.h"
#include "BKE_library_override.h"
#include "BKE_main.h"
#include "BKE_report.h"
#include "BKE_scene.h"
#include "BKE_sound.h"

#ifdef WITH_FFMPEG
#include "IMB_imbuf.h"
#endif

#ifdef WITH_PYTHON
#include "BPY_extern.h"
#endif

#include "RE_engine.h"
#include "RE_pipeline.h"

#include "ED_datafiles.h"

#include "WM_api.h"

#include "GPU_draw.h"

#ifdef WITH_LIBMV
#  include "libmv-capi.h"
#endif

#ifdef WITH_CYCLES_LOGGING
#  include "CCL_api.h"
#endif

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_build.h"
#include "DEG_depsgraph_debug.h"

#include "creator_intern.h"  /* own include */


/* -------------------------------------------------------------------- */

/** \name Utility String Parsing
 * \{ */

static bool parse_int_relative(
        const char *str, const char *str_end_test, int pos, int neg,
        int *r_value, const char **r_err_msg)
{
	char *str_end = NULL;
	long value;

	errno = 0;

	switch (*str) {
		case '+':
			value = pos + strtol(str + 1, &str_end, 10);
			break;
		case '-':
			value = (neg - strtol(str + 1, &str_end, 10)) + 1;
			break;
		default:
			value = strtol(str, &str_end, 10);
			break;
	}


	if (*str_end != '\0' && (str_end != str_end_test)) {
		static const char *msg = "not a number";
		*r_err_msg = msg;
		return false;
	}
	else if ((errno == ERANGE) || ((value < INT_MIN || value > INT_MAX))) {
		static const char *msg = "exceeds range";
		*r_err_msg = msg;
		return false;
	}
	else {
		*r_value = (int)value;
		return true;
	}
}

static const char *parse_int_range_sep_search(const char *str, const char *str_end_test)
{
	const char *str_end_range = NULL;
	if (str_end_test) {
		str_end_range = memchr(str, '.', (str_end_test - str) - 1);
		if (str_end_range && (str_end_range[1] != '.')) {
			str_end_range = NULL;
		}
	}
	else {
		str_end_range = strstr(str, "..");
		if (str_end_range && (str_end_range[2] == '\0')) {
			str_end_range = NULL;
		}
	}
	return str_end_range;
}

/**
 * Parse a number as a range, eg: `1..4`.
 *
 * The \a str_end_range argument is a result of #parse_int_range_sep_search.
 */
static bool parse_int_range_relative(
        const char *str, const char *str_end_range, const char *str_end_test, int pos, int neg,
        int r_value_range[2], const char **r_err_msg)
{
	if (parse_int_relative(str,               str_end_range, pos, neg, &r_value_range[0], r_err_msg) &&
	    parse_int_relative(str_end_range + 2, str_end_test,  pos, neg, &r_value_range[1], r_err_msg))
	{
		return true;
	}
	else {
		return false;
	}
}

static bool parse_int_relative_clamp(
        const char *str, const char *str_end_test, int pos, int neg, int min, int max,
        int *r_value, const char **r_err_msg)
{
	if (parse_int_relative(str, str_end_test, pos, neg, r_value, r_err_msg)) {
		CLAMP(*r_value, min, max);
		return true;
	}
	else {
		return false;
	}
}

static bool parse_int_range_relative_clamp(
        const char *str, const char *str_end_range, const char *str_end_test, int pos, int neg, int min, int max,
        int r_value_range[2], const char **r_err_msg)
{
	if (parse_int_range_relative(str, str_end_range, str_end_test, pos, neg, r_value_range, r_err_msg)) {
		CLAMP(r_value_range[0], min, max);
		CLAMP(r_value_range[1], min, max);
		return true;
	}
	else {
		return false;
	}
}

/**
 * No clamping, fails with any number outside the range.
 */
static bool parse_int_strict_range(
        const char *str, const char *str_end_test, const int min, const int max,
        int *r_value, const char **r_err_msg)
{
	char *str_end = NULL;
	long value;

	errno = 0;
	value = strtol(str, &str_end, 10);

	if (*str_end != '\0' && (str_end != str_end_test)) {
		static const char *msg = "not a number";
		*r_err_msg = msg;
		return false;
	}
	else if ((errno == ERANGE) || ((value < min || value > max))) {
		static const char *msg = "exceeds range";
		*r_err_msg = msg;
		return false;
	}
	else {
		*r_value = (int)value;
		return true;
	}
}

static bool parse_int(
        const char *str, const char *str_end_test,
        int *r_value, const char **r_err_msg)
{
	return parse_int_strict_range(str, str_end_test, INT_MIN, INT_MAX, r_value, r_err_msg);
}

static bool parse_int_clamp(
        const char *str, const char *str_end_test, int min, int max,
        int *r_value, const char **r_err_msg)
{
	if (parse_int(str, str_end_test, r_value, r_err_msg)) {
		CLAMP(*r_value, min, max);
		return true;
	}
	else {
		return false;
	}
}

#if 0
/**
 * Version of #parse_int_relative_clamp
 * that parses a comma separated list of numbers.
 */
static int *parse_int_relative_clamp_n(
        const char *str, int pos, int neg, int min, int max,
        int *r_value_len, const char **r_err_msg)
{
	const char sep = ',';
	int len = 1;
	for (int i = 0; str[i]; i++) {
		if (str[i] == sep) {
			len++;
		}
	}

	int *values = MEM_mallocN(sizeof(*values) * len, __func__);
	int i = 0;
	while (true) {
		const char *str_end = strchr(str, sep);
		if ((*str == sep) || (*str == '\0')) {
			static const char *msg = "incorrect comma use";
			*r_err_msg = msg;
			goto fail;

		}
		else if (parse_int_relative_clamp(str, str_end, pos, neg, min, max, &values[i], r_err_msg)) {
			i++;
		}
		else {
			goto fail;  /* error message already set */
		}

		if (str_end) {  /* next */
			str = str_end + 1;
		}
		else {  /* finished */
			break;
		}
	}

	*r_value_len = i;
	return values;

fail:
	MEM_freeN(values);
	return NULL;
}

#endif

/**
 * Version of #parse_int_relative_clamp & #parse_int_range_relative_clamp
 * that parses a comma separated list of numbers.
 *
 * \note single values are evaluated as a range with matching start/end.
 */
static int (*parse_int_range_relative_clamp_n(
        const char *str, int pos, int neg, int min, int max,
        int *r_value_len, const char **r_err_msg))[2]
{
	const char sep = ',';
	int len = 1;
	for (int i = 0; str[i]; i++) {
		if (str[i] == sep) {
			len++;
		}
	}

	int (*values)[2] = MEM_mallocN(sizeof(*values) * len, __func__);
	int i = 0;
	while (true) {
		const char *str_end_range;
		const char *str_end = strchr(str, sep);
		if ((*str == sep) || (*str == '\0')) {
			static const char *msg = "incorrect comma use";
			*r_err_msg = msg;
			goto fail;
		}
		else if ((str_end_range = parse_int_range_sep_search(str, str_end)) ?
		         parse_int_range_relative_clamp(str, str_end_range, str_end, pos, neg, min, max, values[i], r_err_msg) :
		         parse_int_relative_clamp(str, str_end, pos, neg, min, max, &values[i][0], r_err_msg))
		{
			if (str_end_range == NULL) {
				values[i][1] = values[i][0];
			}
			i++;
		}
		else {
			goto fail;  /* error message already set */
		}

		if (str_end) {  /* next */
			str = str_end + 1;
		}
		else {  /* finished */
			break;
		}
	}

	*r_value_len = i;
	return values;

fail:
	MEM_freeN(values);
	return NULL;
}

/** \} */


/* -------------------------------------------------------------------- */

#ifdef WITH_PYTHON

/** \name Utilities Python Context Macro (#BPY_CTX_SETUP)
 * \{ */
struct BlendePyContextStore {
	wmWindowManager *wm;
	Scene *scene;
	wmWindow *win;
	bool has_win;
};

static void arg_py_context_backup(
        bContext *C, struct BlendePyContextStore *c_py,
        const char *script_id)
{
	c_py->wm = CTX_wm_manager(C);
	c_py->scene = CTX_data_scene(C);
	c_py->has_win = !BLI_listbase_is_empty(&c_py->wm->windows);
	if (c_py->has_win) {
		c_py->win = CTX_wm_window(C);
		CTX_wm_window_set(C, c_py->wm->windows.first);
	}
	else {
		c_py->win = NULL;
		fprintf(stderr, "Python script \"%s\" "
		        "running with missing context data.\n", script_id);
	}
}

static void arg_py_context_restore(
        bContext *C, struct BlendePyContextStore *c_py)
{
	/* script may load a file, check old data is valid before using */
	if (c_py->has_win) {
		if ((c_py->win == NULL) ||
		    ((BLI_findindex(&G_MAIN->wm, c_py->wm) != -1) &&
		     (BLI_findindex(&c_py->wm->windows, c_py->win) != -1)))
		{
			CTX_wm_window_set(C, c_py->win);
		}
	}

	if ((c_py->scene == NULL) ||
	    BLI_findindex(&G_MAIN->scene, c_py->scene) != -1)
	{
		CTX_data_scene_set(C, c_py->scene);
	}
}

/* macro for context setup/reset */
#define BPY_CTX_SETUP(_cmd) \
	{ \
		struct BlendePyContextStore py_c; \
		arg_py_context_backup(C, &py_c, argv[1]); \
		{ _cmd; } \
		arg_py_context_restore(C, &py_c); \
	} ((void)0)

#endif /* WITH_PYTHON */

/** \} */

/* -------------------------------------------------------------------- */

/** \name Handle Argument Callbacks
 *
 * \note Doc strings here are used in differently:
 *
 * - The `--help` message.
 * - The man page (for Unix systems),
 *   see: `doc/manpage/blender.1.py`
 * - Parsed and extracted for the manual,
 *   which converts our ad-hoc formatting to reStructuredText.
 *   see: https://docs.blender.org/manual/en/dev/advanced/command_line.html
 *
 * \{ */

static const char arg_handle_print_version_doc[] =
"\n\tPrint Blender version and exit."
;
static int arg_handle_print_version(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	printf(BLEND_VERSION_STRING_FMT);
#ifdef BUILD_DATE
	printf("\tbuild date: %s\n", build_date);
	printf("\tbuild time: %s\n", build_time);
	printf("\tbuild commit date: %s\n", build_commit_date);
	printf("\tbuild commit time: %s\n", build_commit_time);
	printf("\tbuild hash: %s\n", build_hash);
	printf("\tbuild platform: %s\n", build_platform);
	printf("\tbuild type: %s\n", build_type);
	printf("\tbuild c flags: %s\n", build_cflags);
	printf("\tbuild c++ flags: %s\n", build_cxxflags);
	printf("\tbuild link flags: %s\n", build_linkflags);
	printf("\tbuild system: %s\n", build_system);
#endif
	exit(0);

	return 0;
}

static const char arg_handle_print_help_doc[] =
"\n\tPrint this help text and exit."
;
static const char arg_handle_print_help_doc_win32[] =
"\n\tPrint this help text and exit (windows only)."
;
static int arg_handle_print_help(int UNUSED(argc), const char **UNUSED(argv), void *data)
{
	bArgs *ba = (bArgs *)data;

	printf(BLEND_VERSION_STRING_FMT);
	printf("Usage: blender [args ...] [file] [args ...]\n\n");

	printf("Render Options:\n");
	BLI_argsPrintArgDoc(ba, "--background");
	BLI_argsPrintArgDoc(ba, "--render-anim");
	BLI_argsPrintArgDoc(ba, "--scene");
	BLI_argsPrintArgDoc(ba, "--render-frame");
	BLI_argsPrintArgDoc(ba, "--frame-start");
	BLI_argsPrintArgDoc(ba, "--frame-end");
	BLI_argsPrintArgDoc(ba, "--frame-jump");
	BLI_argsPrintArgDoc(ba, "--render-output");
	BLI_argsPrintArgDoc(ba, "--engine");
	BLI_argsPrintArgDoc(ba, "--threads");

	printf("\n");
	printf("Format Options:\n");
	BLI_argsPrintArgDoc(ba, "--render-format");
	BLI_argsPrintArgDoc(ba, "--use-extension");

	printf("\n");
	printf("Animation Playback Options:\n");
	BLI_argsPrintArgDoc(ba, "-a");

	printf("\n");
	printf("Window Options:\n");
	BLI_argsPrintArgDoc(ba, "--window-border");
	BLI_argsPrintArgDoc(ba, "--window-fullscreen");
	BLI_argsPrintArgDoc(ba, "--window-geometry");
	BLI_argsPrintArgDoc(ba, "--start-console");
	BLI_argsPrintArgDoc(ba, "--no-native-pixels");
	BLI_argsPrintArgDoc(ba, "--no-window-focus");

	printf("\n");
	printf("Python Options:\n");
	BLI_argsPrintArgDoc(ba, "--enable-autoexec");
	BLI_argsPrintArgDoc(ba, "--disable-autoexec");

	printf("\n");

	BLI_argsPrintArgDoc(ba, "--python");
	BLI_argsPrintArgDoc(ba, "--python-text");
	BLI_argsPrintArgDoc(ba, "--python-expr");
	BLI_argsPrintArgDoc(ba, "--python-console");
	BLI_argsPrintArgDoc(ba, "--python-exit-code");
	BLI_argsPrintArgDoc(ba, "--addons");

	printf("\n");
	printf("Logging Options:\n");
	BLI_argsPrintArgDoc(ba, "--log");
	BLI_argsPrintArgDoc(ba, "--log-level");
	BLI_argsPrintArgDoc(ba, "--log-show-basename");
	BLI_argsPrintArgDoc(ba, "--log-show-backtrace");
	BLI_argsPrintArgDoc(ba, "--log-file");

	printf("\n");
	printf("Debug Options:\n");
	BLI_argsPrintArgDoc(ba, "--debug");
	BLI_argsPrintArgDoc(ba, "--debug-value");

	printf("\n");
	BLI_argsPrintArgDoc(ba, "--debug-events");
#ifdef WITH_FFMPEG
	BLI_argsPrintArgDoc(ba, "--debug-ffmpeg");
#endif
	BLI_argsPrintArgDoc(ba, "--debug-handlers");
#ifdef WITH_LIBMV
	BLI_argsPrintArgDoc(ba, "--debug-libmv");
#endif
#ifdef WITH_CYCLES_LOGGING
	BLI_argsPrintArgDoc(ba, "--debug-cycles");
#endif
	BLI_argsPrintArgDoc(ba, "--debug-memory");
	BLI_argsPrintArgDoc(ba, "--debug-jobs");
	BLI_argsPrintArgDoc(ba, "--debug-python");
	BLI_argsPrintArgDoc(ba, "--debug-depsgraph");
	BLI_argsPrintArgDoc(ba, "--debug-depsgraph-eval");
	BLI_argsPrintArgDoc(ba, "--debug-depsgraph-build");
	BLI_argsPrintArgDoc(ba, "--debug-depsgraph-tag");
	BLI_argsPrintArgDoc(ba, "--debug-depsgraph-no-threads");

	BLI_argsPrintArgDoc(ba, "--debug-gpumem");
	BLI_argsPrintArgDoc(ba, "--debug-gpu-shaders");
	BLI_argsPrintArgDoc(ba, "--debug-wm");
	BLI_argsPrintArgDoc(ba, "--debug-all");
	BLI_argsPrintArgDoc(ba, "--debug-io");

	printf("\n");
	BLI_argsPrintArgDoc(ba, "--debug-fpe");
	BLI_argsPrintArgDoc(ba, "--disable-crash-handler");

	printf("\n");
	printf("Misc Options:\n");
	BLI_argsPrintArgDoc(ba, "--app-template");
	BLI_argsPrintArgDoc(ba, "--factory-startup");
	BLI_argsPrintArgDoc(ba, "--enable-static-override");
	printf("\n");
	BLI_argsPrintArgDoc(ba, "--env-system-datafiles");
	BLI_argsPrintArgDoc(ba, "--env-system-scripts");
	BLI_argsPrintArgDoc(ba, "--env-system-python");
	printf("\n");
	BLI_argsPrintArgDoc(ba, "-noaudio");
	BLI_argsPrintArgDoc(ba, "-setaudio");

	printf("\n");

	BLI_argsPrintArgDoc(ba, "--help");

#ifdef WIN32
	BLI_argsPrintArgDoc(ba, "-R");
	BLI_argsPrintArgDoc(ba, "-r");
#endif
	BLI_argsPrintArgDoc(ba, "--version");

	BLI_argsPrintArgDoc(ba, "--");

	//printf("\n");
	//printf("Experimental Features:\n");

	/* Other options _must_ be last (anything not handled will show here) */
	printf("\n");
	printf("Other Options:\n");
	BLI_argsPrintOtherDoc(ba);

	printf("\n");
	printf("Argument Parsing:\n");
	printf("\tArguments must be separated by white space, eg:\n");
	printf("\t# blender -ba test.blend\n");
	printf("\t...will ignore the 'a'.\n");
	printf("\t# blender -b test.blend -f8\n");
	printf("\t...will ignore '8' because there is no space between the '-f' and the frame value.\n\n");

	printf("Argument Order:\n");
	printf("\tArguments are executed in the order they are given. eg:\n");
	printf("\t# blender --background test.blend --render-frame 1 --render-output '/tmp'\n");
	printf("\t...will not render to '/tmp' because '--render-frame 1' renders before the output path is set.\n");
	printf("\t# blender --background --render-output /tmp test.blend --render-frame 1\n");
	printf("\t...will not render to '/tmp' because loading the blend-file overwrites the render output that was set.\n");
	printf("\t# blender --background test.blend --render-output /tmp --render-frame 1\n");
	printf("\t...works as expected.\n\n");

	printf("Environment Variables:\n");
	printf("  $BLENDER_USER_CONFIG      Directory for user configuration files.\n");
	printf("  $BLENDER_USER_SCRIPTS     Directory for user scripts.\n");
	printf("  $BLENDER_SYSTEM_SCRIPTS   Directory for system wide scripts.\n");
	printf("  $BLENDER_USER_DATAFILES   Directory for user data files (icons, translations, ..).\n");
	printf("  $BLENDER_SYSTEM_DATAFILES Directory for system wide data files.\n");
	printf("  $BLENDER_SYSTEM_PYTHON    Directory for system Python libraries.\n");
#ifdef WIN32
	printf("  $TEMP                     Store temporary files here.\n");
#else
	printf("  $TMP or $TMPDIR           Store temporary files here.\n");
#endif
#ifdef WITH_SDL
	printf("  $SDL_AUDIODRIVER          LibSDL audio driver - alsa, esd, dma.\n");
#endif
	printf("  $PYTHONHOME               Path to the Python directory, eg. /usr/lib/python.\n\n");

	exit(0);

	return 0;
}

static const char arg_handle_arguments_end_doc[] =
"\n\tEnd option processing, following arguments passed unchanged. Access via Python's 'sys.argv'."
;
static int arg_handle_arguments_end(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	return -1;
}

/* only to give help message */
#ifndef WITH_PYTHON_SECURITY /* default */
#  define   PY_ENABLE_AUTO ", (default)"
#  define   PY_DISABLE_AUTO ""
#else
#  define   PY_ENABLE_AUTO ""
#  define   PY_DISABLE_AUTO ", (compiled as non-standard default)"
#endif

static const char arg_handle_python_set_doc_enable[] =
"\n\tEnable automatic Python script execution" PY_ENABLE_AUTO "."
;
static const char arg_handle_python_set_doc_disable[] =
"\n\tDisable automatic Python script execution (pydrivers & startup scripts)" PY_DISABLE_AUTO "."
;
#undef PY_ENABLE_AUTO
#undef PY_DISABLE_AUTO

static int arg_handle_python_set(int UNUSED(argc), const char **UNUSED(argv), void *data)
{
	if ((bool)data) {
		G.f |= G_SCRIPT_AUTOEXEC;
	}
	else {
		G.f &= ~G_SCRIPT_AUTOEXEC;
	}
	G.f |= G_SCRIPT_OVERRIDE_PREF;
	return 0;
}

static const char arg_handle_crash_handler_disable_doc[] =
"\n\tDisable the crash handler."
;
static int arg_handle_crash_handler_disable(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	app_state.signal.use_crash_handler = false;
	return 0;
}

static const char arg_handle_abort_handler_disable_doc[] =
"\n\tDisable the abort handler."
;
static int arg_handle_abort_handler_disable(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	app_state.signal.use_abort_handler = false;
	return 0;
}

static const char arg_handle_background_mode_set_doc[] =
"\n\tRun in background (often used for UI-less rendering)."
;
static int arg_handle_background_mode_set(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	G.background = 1;
	return 0;
}

static const char arg_handle_log_level_set_doc[] =
"<level>\n"
"\n"
"\tSet the logging verbosity level (higher for more details) defaults to 1, use -1 to log all levels."
;
static int arg_handle_log_level_set(int argc, const char **argv, void *UNUSED(data))
{
	const char *arg_id = "--log-level";
	if (argc > 1) {
		const char *err_msg = NULL;
		if (!parse_int_clamp(argv[1], NULL, -1, INT_MAX, &G.log.level, &err_msg)) {
			printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
		}
		else {
			if (G.log.level == -1) {
				G.log.level = INT_MAX;
			}
			CLG_level_set(G.log.level);
		}
		return 1;
	}
	else {
		printf("\nError: '%s' no args given.\n", arg_id);
		return 0;
	}
}

static const char arg_handle_log_show_basename_set_doc[] =
"\n\tOnly show file name in output (not the leading path)."
;
static int arg_handle_log_show_basename_set(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	CLG_output_use_basename_set(true);
	return 0;
}

static const char arg_handle_log_show_backtrace_set_doc[] =
"\n\tShow a back trace for each log message (debug builds only)."
;
static int arg_handle_log_show_backtrace_set(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	/* Ensure types don't become incompatible. */
	void (*fn)(FILE *fp) = BLI_system_backtrace;
	CLG_backtrace_fn_set((void (*)(void *))fn);
	return 0;
}

static const char arg_handle_log_file_set_doc[] =
"<filename>\n"
"\n"
"\tSet a file to output the log to."
;
static int arg_handle_log_file_set(int argc, const char **argv, void *UNUSED(data))
{
	const char *arg_id = "--log-file";
	if (argc > 1) {
		errno = 0;
		FILE *fp = BLI_fopen(argv[1], "w");
		if (fp == NULL) {
			const char *err_msg = errno ? strerror(errno) : "unknown";
			printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
		}
		else {
			if (UNLIKELY(G.log.file != NULL)) {
				fclose(G.log.file);
			}
			G.log.file = fp;
			CLG_output_set(G.log.file);
		}
		return 1;
	}
	else {
		printf("\nError: '%s' no args given.\n", arg_id);
		return 0;
	}
}

static const char arg_handle_log_set_doc[] =
"<match>\n"
"\tEnable logging categories, taking a single comma separated argument.\n"
"\tMultiple categories can be matched using a '.*' suffix,\n"
"\tso '--log \"wm.*\"' logs every kind of window-manager message.\n"
"\tUse \"^\" prefix to ignore, so '--log \"*,^wm.operator.*\"' logs all except for 'wm.operators.*'\n"
"\tUse \"*\" to log everything."
;
static int arg_handle_log_set(int argc, const char **argv, void *UNUSED(data))
{
	const char *arg_id = "--log";
	if (argc > 1) {
		const char *str_step = argv[1];
		while (*str_step) {
			const char *str_step_end = strchr(str_step, ',');
			int str_step_len = str_step_end ? (str_step_end - str_step) : strlen(str_step);

			if (str_step[0] == '^') {
				CLG_type_filter_exclude(str_step + 1, str_step_len - 1);
			}
			else {
				CLG_type_filter_include(str_step, str_step_len);
			}

			if (str_step_end) {
				/* typically only be one, but don't fail on multiple.*/
				while (*str_step_end == ',') {
					str_step_end++;
				}
				str_step = str_step_end;
			}
			else {
				break;
			}
		}
		return 1;
	}
	else {
		printf("\nError: '%s' no args given.\n", arg_id);
		return 0;
	}
}

static const char arg_handle_debug_mode_set_doc[] =
"\n"
"\tTurn debugging on.\n"
"\n"
"\t* Enables memory error detection\n"
"\t* Disables mouse grab (to interact with a debugger in some cases)\n"
"\t* Keeps Python's 'sys.stdin' rather than setting it to None"
;
static int arg_handle_debug_mode_set(int UNUSED(argc), const char **UNUSED(argv), void *data)
{
	G.debug |= G_DEBUG;  /* std output printf's */
	printf(BLEND_VERSION_STRING_FMT);
	MEM_set_memory_debug();
#ifndef NDEBUG
	BLI_mempool_set_memory_debug();
#endif

#ifdef WITH_BUILDINFO
	printf("Build: %s %s %s %s\n", build_date, build_time, build_platform, build_type);
#endif

	BLI_argsPrint(data);
	return 0;
}

#ifdef WITH_FFMPEG
static const char arg_handle_debug_mode_generic_set_doc_ffmpeg[] =
"\n\tEnable debug messages from FFmpeg library.";
#endif
#ifdef WITH_FREESTYLE
static const char arg_handle_debug_mode_generic_set_doc_freestyle[] =
"\n\tEnable debug messages for FreeStyle.";
#endif
static const char arg_handle_debug_mode_generic_set_doc_python[] =
"\n\tEnable debug messages for Python.";
static const char arg_handle_debug_mode_generic_set_doc_events[] =
"\n\tEnable debug messages for the event system.";
static const char arg_handle_debug_mode_generic_set_doc_handlers[] =
"\n\tEnable debug messages for event handling.";
static const char arg_handle_debug_mode_generic_set_doc_wm[] =
"\n\tEnable debug messages for the window manager, shows all operators in search, shows keymap errors.";
static const char arg_handle_debug_mode_generic_set_doc_jobs[] =
"\n\tEnable time profiling for background jobs.";
static const char arg_handle_debug_mode_generic_set_doc_gpu[] =
"\n\tEnable gpu debug context and information for OpenGL 4.3+.";
static const char arg_handle_debug_mode_generic_set_doc_depsgraph[] =
"\n\tEnable all debug messages from dependency graph.";
static const char arg_handle_debug_mode_generic_set_doc_depsgraph_build[] =
"\n\tEnable debug messages from dependency graph related on graph construction.";
static const char arg_handle_debug_mode_generic_set_doc_depsgraph_tag[] =
"\n\tEnable debug messages from dependency graph related on tagging.";
static const char arg_handle_debug_mode_generic_set_doc_depsgraph_time[] =
"\n\tEnable debug messages from dependency graph related on timing.";
static const char arg_handle_debug_mode_generic_set_doc_depsgraph_eval[] =
"\n\tEnable debug messages from dependency graph related on evaluation.";
static const char arg_handle_debug_mode_generic_set_doc_depsgraph_no_threads[] =
"\n\tSwitch dependency graph to a single threaded evaluation.";
static const char arg_handle_debug_mode_generic_set_doc_depsgraph_pretty[] =
"\n\tEnable colors for dependency graph debug messages.";
static const char arg_handle_debug_mode_generic_set_doc_gpumem[] =
"\n\tEnable GPU memory stats in status bar.";

static int arg_handle_debug_mode_generic_set(int UNUSED(argc), const char **UNUSED(argv), void *data)
{
	G.debug |= POINTER_AS_INT(data);
	return 0;
}

static const char arg_handle_debug_mode_io_doc[] =
"\n\tEnable debug messages for I/O (collada, ...).";
static int arg_handle_debug_mode_io(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	G.debug |= G_DEBUG_IO;
	return 0;
}

static const char arg_handle_debug_mode_all_doc[] =
"\n\tEnable all debug messages.";
static int arg_handle_debug_mode_all(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	G.debug |= G_DEBUG_ALL;
#ifdef WITH_LIBMV
	libmv_startDebugLogging();
#endif
#ifdef WITH_CYCLES_LOGGING
	CCL_start_debug_logging();
#endif
	return 0;
}

#ifdef WITH_LIBMV
static const char arg_handle_debug_mode_libmv_doc[] =
"\n\tEnable debug messages from libmv library."
;
static int arg_handle_debug_mode_libmv(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	libmv_startDebugLogging();

	return 0;
}
#endif

#ifdef WITH_CYCLES_LOGGING
static const char arg_handle_debug_mode_cycles_doc[] =
"\n\tEnable debug messages from Cycles."
;
static int arg_handle_debug_mode_cycles(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	CCL_start_debug_logging();
	return 0;
}
#endif

static const char arg_handle_debug_mode_memory_set_doc[] =
"\n\tEnable fully guarded memory allocation and debugging."
;
static int arg_handle_debug_mode_memory_set(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	MEM_set_memory_debug();
	return 0;
}

static const char arg_handle_debug_value_set_doc[] =
"<value>\n"
"\tSet debug value of <value> on startup."
;
static int arg_handle_debug_value_set(int argc, const char **argv, void *UNUSED(data))
{
	const char *arg_id = "--debug-value";
	if (argc > 1) {
		const char *err_msg = NULL;
		int value;
		if (!parse_int(argv[1], NULL, &value, &err_msg)) {
			printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
			return 1;
		}

		G.debug_value = value;

		return 1;
	}
	else {
		printf("\nError: you must specify debug value to set.\n");
		return 0;
	}
}

static const char arg_handle_debug_fpe_set_doc[] =
"\n\tEnable floating point exceptions."
;
static int arg_handle_debug_fpe_set(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	main_signal_setup_fpe();
	return 0;
}

static const char arg_handle_app_template_doc[] =
"\n\tSet the application template, use 'default' for none."
;
static int arg_handle_app_template(int argc, const char **argv, void *UNUSED(data))
{
	if (argc > 1) {
		const char *app_template = STREQ(argv[1], "default") ? "" : argv[1];
		WM_init_state_app_template_set(app_template);
		return 1;
	}
	else {
		printf("\nError: App template must follow '--app-template'.\n");
		return 0;
	}
}

static const char arg_handle_factory_startup_set_doc[] =
"\n\tSkip reading the " STRINGIFY(BLENDER_STARTUP_FILE) " in the users home directory."
;
static int arg_handle_factory_startup_set(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	G.factory_startup = 1;
	return 0;
}

static const char arg_handle_enable_static_override_doc[] =
"\n\tEnable Static Override features in the UI."
;
static int arg_handle_enable_static_override(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	BKE_override_static_enable(true);
	return 0;
}

static const char arg_handle_env_system_set_doc_datafiles[] =
"\n\tSet the "STRINGIFY_ARG (BLENDER_SYSTEM_DATAFILES)" environment variable.";
static const char arg_handle_env_system_set_doc_scripts[] =
"\n\tSet the "STRINGIFY_ARG (BLENDER_SYSTEM_SCRIPTS)" environment variable.";
static const char arg_handle_env_system_set_doc_python[] =
"\n\tSet the "STRINGIFY_ARG (BLENDER_SYSTEM_PYTHON)" environment variable.";

static int arg_handle_env_system_set(int argc, const char **argv, void *UNUSED(data))
{
	/* "--env-system-scripts" --> "BLENDER_SYSTEM_SCRIPTS" */

	char env[64] = "BLENDER";
	char *ch_dst = env + 7; /* skip BLENDER */
	const char *ch_src = argv[0] + 5; /* skip --env */

	if (argc < 2) {
		printf("%s requires one argument\n", argv[0]);
		exit(1);
	}

	for (; *ch_src; ch_src++, ch_dst++) {
		*ch_dst = (*ch_src == '-') ? '_' : (*ch_src) - 32; /* toupper() */
	}

	*ch_dst = '\0';
	BLI_setenv(env, argv[1]);
	return 1;
}

static const char arg_handle_playback_mode_doc[] =
"<options> <file(s)>\n"
"\tPlayback <file(s)>, only operates this way when not running in background.\n\n"
"\t-p <sx> <sy>\n"
"\t\tOpen with lower left corner at <sx>, <sy>.\n"
"\t-m\n"
"\t\tRead from disk (Do not buffer).\n"
"\t-f <fps> <fps-base>\n"
"\t\tSpecify FPS to start with.\n"
"\t-j <frame>\n"
"\t\tSet frame step to <frame>.\n"
"\t-s <frame>\n"
"\t\tPlay from <frame>.\n"
"\t-e <frame>\n"
"\t\tPlay until <frame>."
;
static int arg_handle_playback_mode(int argc, const char **argv, void *UNUSED(data))
{
	/* not if -b was given first */
	if (G.background == 0) {
#ifdef WITH_FFMPEG
		/* Setup FFmpeg with current debug flags. */
		IMB_ffmpeg_init();
#endif

		WM_main_playanim(argc, argv); /* not the same argc and argv as before */
		exit(0); /* 2.4x didn't do this */
	}

	return -2;
}

static const char arg_handle_window_geometry_doc[] =
"<sx> <sy> <w> <h>\n"
"\tOpen with lower left corner at <sx>, <sy> and width and height as <w>, <h>."
;
static int arg_handle_window_geometry(int argc, const char **argv, void *UNUSED(data))
{
	const char *arg_id = "-p / --window-geometry";
	int params[4], i;

	if (argc < 5) {
		fprintf(stderr, "Error: requires four arguments '%s'\n", arg_id);
		exit(1);
	}

	for (i = 0; i < 4; i++) {
		const char *err_msg = NULL;
		if (!parse_int(argv[i + 1], NULL, &params[i], &err_msg)) {
			printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
			exit(1);
		}
	}

	WM_init_state_size_set(UNPACK4(params));

	return 4;
}

static const char arg_handle_native_pixels_set_doc[] =
"\n\tDo not use native pixel size, for high resolution displays (MacBook 'Retina')."
;
static int arg_handle_native_pixels_set(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	WM_init_native_pixels(false);
	return 0;
}

static const char arg_handle_with_borders_doc[] =
"\n\tForce opening with borders."
;
static int arg_handle_with_borders(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	WM_init_state_normal_set();
	return 0;
}

static const char arg_handle_without_borders_doc[] =
"\n\tForce opening in fullscreen mode."
;
static int arg_handle_without_borders(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	WM_init_state_fullscreen_set();
	return 0;
}

static const char arg_handle_no_window_focus_doc[] =
"\n\tOpen behind other windows and without taking focus."
;
static int arg_handle_no_window_focus(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	WM_init_window_focus_set(false);
	return 0;
}

extern bool wm_start_with_console; /* wm_init_exit.c */

static const char arg_handle_start_with_console_doc[] =
"\n\tStart with the console window open (ignored if -b is set), (Windows only)."
;
static int arg_handle_start_with_console(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	wm_start_with_console = true;
	return 0;
}

static const char arg_handle_register_extension_doc[] =
"\n\tRegister blend-file extension, then exit (Windows only)."
;
static const char arg_handle_register_extension_doc_silent[] =
"\n\tSilently register blend-file extension, then exit (Windows only)."
;
static int arg_handle_register_extension(int UNUSED(argc), const char **UNUSED(argv), void *data)
{
#ifdef WIN32
	if (data)
		G.background = 1;
	RegisterBlendExtension();
#else
	(void)data; /* unused */
#endif
	return 0;
}

static const char arg_handle_audio_disable_doc[] =
"\n\tForce sound system to None."
;
static int arg_handle_audio_disable(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
{
	BKE_sound_force_device("Null");
	return 0;
}

static const char arg_handle_audio_set_doc[] =
"\n\tForce sound system to a specific device.\n\t'NULL' 'SDL' 'OPENAL' 'JACK'."
;
static int arg_handle_audio_set(int argc, const char **argv, void *UNUSED(data))
{
	if (argc < 1) {
		fprintf(stderr, "-setaudio require one argument\n");
		exit(1);
	}

	BKE_sound_force_device(argv[1]);
	return 1;
}

static const char arg_handle_output_set_doc[] =
"<path>\n"
"\tSet the render path and file name.\n"
"\tUse '//' at the start of the path to render relative to the blend-file.\n"
"\n"
"\tThe '#' characters are replaced by the frame number, and used to define zero padding.\n"
"\n"
"\t* 'ani_##_test.png' becomes 'ani_01_test.png'\n"
"\t* 'test-######.png' becomes 'test-000001.png'\n"
"\n"
"\tWhen the filename does not contain '#', The suffix '####' is added to the filename.\n"
"\n"
"\tThe frame number will be added at the end of the filename, eg:\n"
"\t# blender -b foobar.blend -o //render_ -F PNG -x 1 -a\n"
"\t'//render_' becomes '//render_####', writing frames as '//render_0001.png'"
;
static int arg_handle_output_set(int argc, const char **argv, void *data)
{
	bContext *C = data;
	if (argc > 1) {
		Scene *scene = CTX_data_scene(C);
		if (scene) {
			BLI_strncpy(scene->r.pic, argv[1], sizeof(scene->r.pic));
		}
		else {
			printf("\nError: no blend loaded. cannot use '-o / --render-output'.\n");
		}
		return 1;
	}
	else {
		printf("\nError: you must specify a path after '-o  / --render-output'.\n");
		return 0;
	}
}

static const char arg_handle_engine_set_doc[] =
"<engine>\n"
"\tSpecify the render engine.\n\tUse -E help to list available engines."
;
static int arg_handle_engine_set(int argc, const char **argv, void *data)
{
	bContext *C = data;
	if (argc >= 2) {
		if (STREQ(argv[1], "help")) {
			RenderEngineType *type = NULL;
			printf("Blender Engine Listing:\n");
			for (type = R_engines.first; type; type = type->next) {
				printf("\t%s\n", type->idname);
			}
			exit(0);
		}
		else {
			Scene *scene = CTX_data_scene(C);
			if (scene) {
				if (BLI_findstring(&R_engines, argv[1], offsetof(RenderEngineType, idname))) {
					BLI_strncpy_utf8(scene->r.engine, argv[1], sizeof(scene->r.engine));
				}
				else {
					printf("\nError: engine not found '%s'\n", argv[1]);
					exit(1);
				}
			}
			else {
				printf("\nError: no blend loaded. "
				       "order the arguments so '-E  / --engine ' is after a blend is loaded.\n");
			}
		}

		return 1;
	}
	else {
		printf("\nEngine not specified, give 'help' for a list of available engines.\n");
		return 0;
	}
}

static const char arg_handle_image_type_set_doc[] =
"<format>\n"
"\tSet the render format.\n"
"\tValid options are 'TGA' 'RAWTGA' 'JPEG' 'IRIS' 'IRIZ' 'AVIRAW' 'AVIJPEG' 'PNG' 'BMP'\n"
"\n"
"\tFormats that can be compiled into Blender, not available on all systems: 'HDR' 'TIFF' 'EXR' 'MULTILAYER'\n"
"\t'MPEG' 'CINEON' 'DPX' 'DDS' 'JP2'"
;
static int arg_handle_image_type_set(int argc, const char **argv, void *data)
{
	bContext *C = data;
	if (argc > 1) {
		const char *imtype = argv[1];
		Scene *scene = CTX_data_scene(C);
		if (scene) {
			const char imtype_new = BKE_imtype_from_arg(imtype);

			if (imtype_new == R_IMF_IMTYPE_INVALID) {
				printf("\nError: Format from '-F / --render-format' not known or not compiled in this release.\n");
			}
			else {
				scene->r.im_format.imtype = imtype_new;
			}
		}
		else {
			printf("\nError: no blend loaded. "
			       "order the arguments so '-F  / --render-format' is after the blend is loaded.\n");
		}
		return 1;
	}
	else {
		printf("\nError: you must specify a format after '-F  / --render-foramt'.\n");
		return 0;
	}
}

static const char arg_handle_threads_set_doc[] =
"<threads>\n"
"\tUse amount of <threads> for rendering and other operations\n"
"\t[1-" STRINGIFY(BLENDER_MAX_THREADS) "], 0 for systems processor count."
;
static int arg_handle_threads_set(int argc, const char **argv, void *UNUSED(data))
{
	const char *arg_id = "-t / --threads";
	const int min = 0, max = BLENDER_MAX_THREADS;
	if (argc > 1) {
		const char *err_msg = NULL;
		int threads;
		if (!parse_int_strict_range(argv[1], NULL, min, max, &threads, &err_msg)) {
			printf("\nError: %s '%s %s', expected number in [%d..%d].\n", err_msg, arg_id, argv[1], min, max);
			return 1;
		}

		BLI_system_num_threads_override_set(threads);
		return 1;
	}
	else {
		printf("\nError: you must specify a number of threads in [%d..%d] '%s'.\n", min, max, arg_id);
		return 0;
	}
}

static const char arg_handle_verbosity_set_doc[] =
"<verbose>\n"
"\tSet logging verbosity level."
;
static int arg_handle_verbosity_set(int argc, const char **argv, void *UNUSED(data))
{
	const char *arg_id = "--verbose";
	if (argc > 1) {
		const char *err_msg = NULL;
		int level;
		if (!parse_int(argv[1], NULL, &level, &err_msg)) {
			printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
		}

#ifdef WITH_LIBMV
		libmv_setLoggingVerbosity(level);
#elif defined(WITH_CYCLES_LOGGING)
		CCL_logging_verbosity_set(level);
#else
		(void)level;
#endif

		return 1;
	}
	else {
		printf("\nError: you must specify a verbosity level.\n");
		return 0;
	}
}

static const char arg_handle_extension_set_doc[] =
"<bool>\n"
"\tSet option to add the file extension to the end of the file."
;
static int arg_handle_extension_set(int argc, const char **argv, void *data)
{
	bContext *C = data;
	if (argc > 1) {
		Scene *scene = CTX_data_scene(C);
		if (scene) {
			if (argv[1][0] == '0') {
				scene->r.scemode &= ~R_EXTENSION;
			}
			else if (argv[1][0] == '1') {
				scene->r.scemode |= R_EXTENSION;
			}
			else {
				printf("\nError: Use '-x 1 / -x 0' To set the extension option or '--use-extension'\n");
			}
		}
		else {
			printf("\nError: no blend loaded. "
			       "order the arguments so '-o ' is after '-x '.\n");
		}
		return 1;
	}
	else {
		printf("\nError: you must specify a path after '- '.\n");
		return 0;
	}
}

static const char arg_handle_render_frame_doc[] =
"<frame>\n"
"\tRender frame <frame> and save it.\n"
"\n"
"\t* +<frame> start frame relative, -<frame> end frame relative.\n"
"\t* A comma separated list of frames can also be used (no spaces).\n"
"\t* A range of frames can be expressed using '..' separator between the first and last frames (inclusive).\n"
;
static int arg_handle_render_frame(int argc, const char **argv, void *data)
{
	const char *arg_id = "-f / --render-frame";
	bContext *C = data;
	Scene *scene = CTX_data_scene(C);
	if (scene) {
		Main *bmain = CTX_data_main(C);

		if (argc > 1) {
			const char *err_msg = NULL;
			Render *re;
			ReportList reports;

			int (*frame_range_arr)[2], frames_range_len;
			if ((frame_range_arr = parse_int_range_relative_clamp_n(
			         argv[1], scene->r.sfra, scene->r.efra, MINAFRAME, MAXFRAME,
			         &frames_range_len, &err_msg)) == NULL)
			{
				printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
				return 1;
			}

			re = RE_NewSceneRender(scene);
			BLI_threaded_malloc_begin();
			BKE_reports_init(&reports, RPT_STORE);
			RE_SetReports(re, &reports);
			for (int i = 0; i < frames_range_len; i++) {
				/* We could pass in frame ranges,
				 * but prefer having exact behavior as passing in multiple frames */
				if ((frame_range_arr[i][0] <= frame_range_arr[i][1]) == 0) {
					printf("\nWarning: negative range ignored '%s %s'.\n", arg_id, argv[1]);
				}

				for (int frame = frame_range_arr[i][0]; frame <= frame_range_arr[i][1]; frame++) {
					RE_BlenderAnim(re, bmain, scene, NULL, NULL, frame, frame, scene->r.frame_step);
				}
			}
			RE_SetReports(re, NULL);
			BKE_reports_clear(&reports);
			BLI_threaded_malloc_end();
			MEM_freeN(frame_range_arr);
			return 1;
		}
		else {
			printf("\nError: frame number must follow '%s'.\n", arg_id);
			return 0;
		}
	}
	else {
		printf("\nError: no blend loaded. cannot use '%s'.\n", arg_id);
		return 0;
	}
}

static const char arg_handle_render_animation_doc[] =
"\n\tRender frames from start to end (inclusive)."
;
static int arg_handle_render_animation(int UNUSED(argc), const char **UNUSED(argv), void *data)
{
	bContext *C = data;
	Scene *scene = CTX_data_scene(C);
	if (scene) {
		Main *bmain = CTX_data_main(C);
		Render *re = RE_NewSceneRender(scene);
		ReportList reports;
		BLI_threaded_malloc_begin();
		BKE_reports_init(&reports, RPT_STORE);
		RE_SetReports(re, &reports);
		RE_BlenderAnim(re, bmain, scene, NULL, NULL, scene->r.sfra, scene->r.efra, scene->r.frame_step);
		RE_SetReports(re, NULL);
		BKE_reports_clear(&reports);
		BLI_threaded_malloc_end();
	}
	else {
		printf("\nError: no blend loaded. cannot use '-a'.\n");
	}
	return 0;
}

static const char arg_handle_scene_set_doc[] =
"<name>\n"
"\tSet the active scene <name> for rendering."
;
static int arg_handle_scene_set(int argc, const char **argv, void *data)
{
	if (argc > 1) {
		bContext *C = data;
		Scene *scene = BKE_scene_set_name(CTX_data_main(C), argv[1]);
		if (scene) {
			CTX_data_scene_set(C, scene);

			/* Set the scene of the first window, see: T55991,
			 * otherwise scrips that run later won't get this scene back from the context. */
			wmWindow *win = CTX_wm_window(C);
			if (win == NULL) {
				win = CTX_wm_manager(C)->windows.first;
			}
			if (win != NULL) {
				WM_window_set_active_scene(CTX_data_main(C), C, win, scene);
			}
		}
		return 1;
	}
	else {
		printf("\nError: Scene name must follow '-S / --scene'.\n");
		return 0;
	}
}

static const char arg_handle_frame_start_set_doc[] =
"<frame>\n"
"\tSet start to frame <frame>, supports +/- for relative frames too."
;
static int arg_handle_frame_start_set(int argc, const char **argv, void *data)
{
	const char *arg_id = "-s / --frame-start";
	bContext *C = data;
	Scene *scene = CTX_data_scene(C);
	if (scene) {
		if (argc > 1) {
			const char *err_msg = NULL;
			if (!parse_int_relative_clamp(
			        argv[1], NULL, scene->r.sfra, scene->r.sfra - 1, MINAFRAME, MAXFRAME,
			        &scene->r.sfra, &err_msg))
			{
				printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
			}
			return 1;
		}
		else {
			printf("\nError: frame number must follow '%s'.\n", arg_id);
			return 0;
		}
	}
	else {
		printf("\nError: no blend loaded. cannot use '%s'.\n", arg_id);
		return 0;
	}
}

static const char arg_handle_frame_end_set_doc[] =
"<frame>\n"
"\tSet end to frame <frame>, supports +/- for relative frames too."
;
static int arg_handle_frame_end_set(int argc, const char **argv, void *data)
{
	const char *arg_id = "-e / --frame-end";
	bContext *C = data;
	Scene *scene = CTX_data_scene(C);
	if (scene) {
		if (argc > 1) {
			const char *err_msg = NULL;
			if (!parse_int_relative_clamp(
			        argv[1], NULL, scene->r.efra, scene->r.efra - 1, MINAFRAME, MAXFRAME,
			        &scene->r.efra, &err_msg))
			{
				printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
			}
			return 1;
		}
		else {
			printf("\nError: frame number must follow '%s'.\n", arg_id);
			return 0;
		}
	}
	else {
		printf("\nError: no blend loaded. cannot use '%s'.\n", arg_id);
		return 0;
	}
}

static const char arg_handle_frame_skip_set_doc[] =
"<frames>\n"
"\tSet number of frames to step forward after each rendered frame."
;
static int arg_handle_frame_skip_set(int argc, const char **argv, void *data)
{
	const char *arg_id = "-j / --frame-jump";
	bContext *C = data;
	Scene *scene = CTX_data_scene(C);
	if (scene) {
		if (argc > 1) {
			const char *err_msg = NULL;
			if (!parse_int_clamp(argv[1], NULL, 1, MAXFRAME, &scene->r.frame_step, &err_msg)) {
				printf("\nError: %s '%s %s'.\n", err_msg, arg_id, argv[1]);
			}
			return 1;
		}
		else {
			printf("\nError: number of frames to step must follow '%s'.\n", arg_id);
			return 0;
		}
	}
	else {
		printf("\nError: no blend loaded. cannot use '%s'.\n", arg_id);
		return 0;
	}
}

static const char arg_handle_python_file_run_doc[] =
"<filename>\n"
"\tRun the given Python script file."
;
static int arg_handle_python_file_run(int argc, const char **argv, void *data)
{
#ifdef WITH_PYTHON
	bContext *C = data;

	/* workaround for scripts not getting a bpy.context.scene, causes internal errors elsewhere */
	if (argc > 1) {
		/* Make the path absolute because its needed for relative linked blends to be found */
		char filename[FILE_MAX];
		BLI_strncpy(filename, argv[1], sizeof(filename));
		BLI_path_cwd(filename, sizeof(filename));

		bool ok;
		BPY_CTX_SETUP(ok = BPY_execute_filepath(C, filename, NULL));
		if (!ok && app_state.exit_code_on_error.python) {
			printf("\nError: script failed, file: '%s', exiting.\n", argv[1]);
			exit(app_state.exit_code_on_error.python);
		}
		return 1;
	}
	else {
		printf("\nError: you must specify a filepath after '%s'.\n", argv[0]);
		return 0;
	}
#else
	UNUSED_VARS(argc, argv, data);
	printf("This Blender was built without Python support\n");
	return 0;
#endif /* WITH_PYTHON */
}

static const char arg_handle_python_text_run_doc[] =
"<name>\n"
"\tRun the given Python script text block."
;
static int arg_handle_python_text_run(int argc, const char **argv, void *data)
{
#ifdef WITH_PYTHON
	bContext *C = data;

	/* workaround for scripts not getting a bpy.context.scene, causes internal errors elsewhere */
	if (argc > 1) {
		Main *bmain = CTX_data_main(C);
		/* Make the path absolute because its needed for relative linked blends to be found */
		struct Text *text = (struct Text *)BKE_libblock_find_name(bmain, ID_TXT, argv[1]);
		bool ok;

		if (text) {
			BPY_CTX_SETUP(ok = BPY_execute_text(C, text, NULL, false));
		}
		else {
			printf("\nError: text block not found %s.\n", argv[1]);
			ok = false;
		}

		if (!ok && app_state.exit_code_on_error.python) {
			printf("\nError: script failed, text: '%s', exiting.\n", argv[1]);
			exit(app_state.exit_code_on_error.python);
		}

		return 1;
	}
	else {
		printf("\nError: you must specify a text block after '%s'.\n", argv[0]);
		return 0;
	}
#else
	UNUSED_VARS(argc, argv, data);
	printf("This Blender was built without Python support\n");
	return 0;
#endif /* WITH_PYTHON */
}

static const char arg_handle_python_expr_run_doc[] =
"<expression>\n"
"\tRun the given expression as a Python script."
;
static int arg_handle_python_expr_run(int argc, const char **argv, void *data)
{
#ifdef WITH_PYTHON
	bContext *C = data;

	/* workaround for scripts not getting a bpy.context.scene, causes internal errors elsewhere */
	if (argc > 1) {
		bool ok;
		BPY_CTX_SETUP(ok = BPY_execute_string_ex(C, NULL, argv[1], false));
		if (!ok && app_state.exit_code_on_error.python) {
			printf("\nError: script failed, expr: '%s', exiting.\n", argv[1]);
			exit(app_state.exit_code_on_error.python);
		}
		return 1;
	}
	else {
		printf("\nError: you must specify a Python expression after '%s'.\n", argv[0]);
		return 0;
	}
#else
	UNUSED_VARS(argc, argv, data);
	printf("This Blender was built without Python support\n");
	return 0;
#endif /* WITH_PYTHON */
}

static const char arg_handle_python_console_run_doc[] =
"\n\tRun Blender with an interactive console."
;
static int arg_handle_python_console_run(int UNUSED(argc), const char **argv, void *data)
{
#ifdef WITH_PYTHON
	bContext *C = data;

	BPY_CTX_SETUP(BPY_execute_string(C, (const char *[]){"code", NULL}, "code.interact()"));

	return 0;
#else
	UNUSED_VARS(argv, data);
	printf("This Blender was built without python support\n");
	return 0;
#endif /* WITH_PYTHON */
}

static const char arg_handle_python_exit_code_set_doc[] =
"<code>\n"
"\tSet the exit-code in [0..255] to exit if a Python exception is raised\n"
"\t(only for scripts executed from the command line), zero disables."
;
static int arg_handle_python_exit_code_set(int argc, const char **argv, void *UNUSED(data))
{
	const char *arg_id = "--python-exit-code";
	if (argc > 1) {
		const char *err_msg = NULL;
		const int min = 0, max = 255;
		int exit_code;
		if (!parse_int_strict_range(argv[1], NULL, min, max, &exit_code, &err_msg)) {
			printf("\nError: %s '%s %s', expected number in [%d..%d].\n", err_msg, arg_id, argv[1], min, max);
			return 1;
		}

		app_state.exit_code_on_error.python = (unsigned char)exit_code;
		return 1;
	}
	else {
		printf("\nError: you must specify an exit code number '%s'.\n", arg_id);
		return 0;
	}
}

static const char arg_handle_addons_set_doc[] =
"<addon(s)>\n"
"\tComma separated list of add-ons (no spaces)."
;
static int arg_handle_addons_set(int argc, const char **argv, void *data)
{
	/* workaround for scripts not getting a bpy.context.scene, causes internal errors elsewhere */
	if (argc > 1) {
#ifdef WITH_PYTHON
		const char script_str[] =
		        "from addon_utils import check, enable\n"
		        "for m in '%s'.split(','):\n"
		        "    if check(m)[1] is False:\n"
		        "        enable(m, persistent=True)";
		const int slen = strlen(argv[1]) + (sizeof(script_str) - 2);
		char *str = malloc(slen);
		bContext *C = data;
		BLI_snprintf(str, slen, script_str, argv[1]);

		BLI_assert(strlen(str) + 1 == slen);
		BPY_CTX_SETUP(BPY_execute_string_ex(C, NULL, str, false));
		free(str);
#else
		UNUSED_VARS(argv, data);
#endif /* WITH_PYTHON */
		return 1;
	}
	else {
		printf("\nError: you must specify a comma separated list after '--addons'.\n");
		return 0;
	}
}

static int arg_handle_load_file(int UNUSED(argc), const char **argv, void *data)
{
	bContext *C = data;
	ReportList reports;
	bool success;

	/* Make the path absolute because its needed for relative linked blends to be found */
	char filename[FILE_MAX];

	/* note, we could skip these, but so far we always tried to load these files */
	if (argv[0][0] == '-') {
		fprintf(stderr, "unknown argument, loading as file: %s\n", argv[0]);
	}

	BLI_strncpy(filename, argv[0], sizeof(filename));
	BLI_path_cwd(filename, sizeof(filename));

	/* load the file */
	BKE_reports_init(&reports, RPT_PRINT);
	WM_file_autoexec_init(filename);
	success = WM_file_read(C, filename, &reports);
	BKE_reports_clear(&reports);

	if (success) {
		if (G.background) {
			/* ensuer we use 'C->data.scene' for background render */
			CTX_wm_window_set(C, NULL);
		}
	}
	else {
		/* failed to load file, stop processing arguments if running in background mode */
		if (G.background) {
			/* Set is_break if running in the background mode so
			 * blender will return non-zero exit code which then
			 * could be used in automated script to control how
			 * good or bad things are.
			 */
			G.is_break = true;
			return -1;
		}

		if (BLO_has_bfile_extension(filename)) {
			/* Just pretend a file was loaded, so the user can press Save and it'll save at the filename from the CLI. */
			BLI_strncpy(G_MAIN->name, filename, FILE_MAX);
			G.relbase_valid = true;
			G.save_over = true;
			printf("... opened default scene instead; saving will write to: %s\n", filename);
		}
		else {
			printf("Error: argument has no '.blend' file extension, not using as new file, exiting! %s\n", filename);
			G.is_break = true;
			WM_exit(C);
		}
	}

	G.file_loaded = 1;

	return 0;
}


void main_args_setup(bContext *C, bArgs *ba)
{

#define CB(a) a##_doc, a
#define CB_EX(a, b) a##_doc_##b, a

	//BLI_argsAdd(ba, pass, short_arg, long_arg, doc, cb, C);

	/* end argument processing after -- */
	BLI_argsAdd(ba, -1, "--", NULL, CB(arg_handle_arguments_end), NULL);

	/* first pass: background mode, disable python and commands that exit after usage */
	BLI_argsAdd(ba, 1, "-h", "--help", CB(arg_handle_print_help), ba);
	/* Windows only */
	BLI_argsAdd(ba, 1, "/?", NULL, CB_EX(arg_handle_print_help, win32), ba);

	BLI_argsAdd(ba, 1, "-v", "--version", CB(arg_handle_print_version), NULL);

	BLI_argsAdd(ba, 1, "-y", "--enable-autoexec", CB_EX(arg_handle_python_set, enable), (void *)true);
	BLI_argsAdd(ba, 1, "-Y", "--disable-autoexec", CB_EX(arg_handle_python_set, disable), (void *)false);

	BLI_argsAdd(ba, 1, NULL, "--disable-crash-handler", CB(arg_handle_crash_handler_disable), NULL);
	BLI_argsAdd(ba, 1, NULL, "--disable-abort-handler", CB(arg_handle_abort_handler_disable), NULL);

	BLI_argsAdd(ba, 1, "-b", "--background", CB(arg_handle_background_mode_set), NULL);

	BLI_argsAdd(ba, 1, "-a", NULL, CB(arg_handle_playback_mode), NULL);

	BLI_argsAdd(ba, 1, NULL, "--log", CB(arg_handle_log_set), ba);
	BLI_argsAdd(ba, 1, NULL, "--log-level", CB(arg_handle_log_level_set), ba);
	BLI_argsAdd(ba, 1, NULL, "--log-show-basename", CB(arg_handle_log_show_basename_set), ba);
	BLI_argsAdd(ba, 1, NULL, "--log-show-backtrace", CB(arg_handle_log_show_backtrace_set), ba);
	BLI_argsAdd(ba, 1, NULL, "--log-file", CB(arg_handle_log_file_set), ba);

	BLI_argsAdd(ba, 1, "-d", "--debug", CB(arg_handle_debug_mode_set), ba);

#ifdef WITH_FFMPEG
	BLI_argsAdd(ba, 1, NULL, "--debug-ffmpeg",
	            CB_EX(arg_handle_debug_mode_generic_set, ffmpeg), (void *)G_DEBUG_FFMPEG);
#endif

#ifdef WITH_FREESTYLE
	BLI_argsAdd(ba, 1, NULL, "--debug-freestyle",
	            CB_EX(arg_handle_debug_mode_generic_set, freestyle), (void *)G_DEBUG_FREESTYLE);
#endif

	BLI_argsAdd(ba, 1, NULL, "--debug-python",
	            CB_EX(arg_handle_debug_mode_generic_set, python), (void *)G_DEBUG_PYTHON);
	BLI_argsAdd(ba, 1, NULL, "--debug-events",
	            CB_EX(arg_handle_debug_mode_generic_set, events), (void *)G_DEBUG_EVENTS);
	BLI_argsAdd(ba, 1, NULL, "--debug-handlers",
	            CB_EX(arg_handle_debug_mode_generic_set, handlers), (void *)G_DEBUG_HANDLERS);
	BLI_argsAdd(ba, 1, NULL, "--debug-wm",
	            CB_EX(arg_handle_debug_mode_generic_set, wm), (void *)G_DEBUG_WM);
	BLI_argsAdd(ba, 1, NULL, "--debug-all", CB(arg_handle_debug_mode_all), NULL);

	BLI_argsAdd(ba, 1, NULL, "--debug-io", CB(arg_handle_debug_mode_io), NULL);

	BLI_argsAdd(ba, 1, NULL, "--debug-fpe",
	            CB(arg_handle_debug_fpe_set), NULL);

#ifdef WITH_LIBMV
	BLI_argsAdd(ba, 1, NULL, "--debug-libmv", CB(arg_handle_debug_mode_libmv), NULL);
#endif
#ifdef WITH_CYCLES_LOGGING
	BLI_argsAdd(ba, 1, NULL, "--debug-cycles", CB(arg_handle_debug_mode_cycles), NULL);
#endif
	BLI_argsAdd(ba, 1, NULL, "--debug-memory", CB(arg_handle_debug_mode_memory_set), NULL);

	BLI_argsAdd(ba, 1, NULL, "--debug-value",
	            CB(arg_handle_debug_value_set), NULL);
	BLI_argsAdd(ba, 1, NULL, "--debug-jobs",
	            CB_EX(arg_handle_debug_mode_generic_set, jobs), (void *)G_DEBUG_JOBS);
	BLI_argsAdd(ba, 1, NULL, "--debug-gpu",
	            CB_EX(arg_handle_debug_mode_generic_set, gpu), (void *)G_DEBUG_GPU);
	BLI_argsAdd(ba, 1, NULL, "--debug-depsgraph",
	            CB_EX(arg_handle_debug_mode_generic_set, depsgraph), (void *)G_DEBUG_DEPSGRAPH);
	BLI_argsAdd(ba, 1, NULL, "--debug-depsgraph-build",
	            CB_EX(arg_handle_debug_mode_generic_set, depsgraph_build), (void *)G_DEBUG_DEPSGRAPH_BUILD);
	BLI_argsAdd(ba, 1, NULL, "--debug-depsgraph-eval",
	            CB_EX(arg_handle_debug_mode_generic_set, depsgraph_eval), (void *)G_DEBUG_DEPSGRAPH_EVAL);
	BLI_argsAdd(ba, 1, NULL, "--debug-depsgraph-tag",
	            CB_EX(arg_handle_debug_mode_generic_set, depsgraph_tag), (void *)G_DEBUG_DEPSGRAPH_TAG);
	BLI_argsAdd(ba, 1, NULL, "--debug-depsgraph-time",
	            CB_EX(arg_handle_debug_mode_generic_set, depsgraph_time), (void *)G_DEBUG_DEPSGRAPH_TIME);
	BLI_argsAdd(ba, 1, NULL, "--debug-depsgraph-no-threads",
	            CB_EX(arg_handle_debug_mode_generic_set, depsgraph_no_threads), (void *)G_DEBUG_DEPSGRAPH_NO_THREADS);
	BLI_argsAdd(ba, 1, NULL, "--debug-depsgraph-pretty",
	            CB_EX(arg_handle_debug_mode_generic_set, depsgraph_pretty), (void *)G_DEBUG_DEPSGRAPH_PRETTY);
	BLI_argsAdd(ba, 1, NULL, "--debug-gpumem",
	            CB_EX(arg_handle_debug_mode_generic_set, gpumem), (void *)G_DEBUG_GPU_MEM);
	BLI_argsAdd(ba, 1, NULL, "--debug-gpu-shaders",
	            CB_EX(arg_handle_debug_mode_generic_set, gpumem), (void *)G_DEBUG_GPU_SHADERS);
	BLI_argsAdd(ba, 1, NULL, "--debug-gpu-force-workarounds",
	            CB_EX(arg_handle_debug_mode_generic_set, gpumem), (void *)G_DEBUG_GPU_FORCE_WORKAROUNDS);

	BLI_argsAdd(ba, 1, NULL, "--verbose", CB(arg_handle_verbosity_set), NULL);

	BLI_argsAdd(ba, 1, NULL, "--app-template", CB(arg_handle_app_template), NULL);
	BLI_argsAdd(ba, 1, NULL, "--factory-startup", CB(arg_handle_factory_startup_set), NULL);
	BLI_argsAdd(ba, 1, NULL, "--enable-static-override", CB(arg_handle_enable_static_override), NULL);

	/* TODO, add user env vars? */
	BLI_argsAdd(ba, 1, NULL, "--env-system-datafiles", CB_EX(arg_handle_env_system_set, datafiles), NULL);
	BLI_argsAdd(ba, 1, NULL, "--env-system-scripts", CB_EX(arg_handle_env_system_set, scripts), NULL);
	BLI_argsAdd(ba, 1, NULL, "--env-system-python", CB_EX(arg_handle_env_system_set, python), NULL);

	/* second pass: custom window stuff */
	BLI_argsAdd(ba, 2, "-p", "--window-geometry", CB(arg_handle_window_geometry), NULL);
	BLI_argsAdd(ba, 2, "-w", "--window-border", CB(arg_handle_with_borders), NULL);
	BLI_argsAdd(ba, 2, "-W", "--window-fullscreen", CB(arg_handle_without_borders), NULL);
	BLI_argsAdd(ba, 2, NULL, "--no-window-focus", CB(arg_handle_no_window_focus), NULL);
	BLI_argsAdd(ba, 2, "-con", "--start-console", CB(arg_handle_start_with_console), NULL);
	BLI_argsAdd(ba, 2, "-R", NULL, CB(arg_handle_register_extension), NULL);
	BLI_argsAdd(ba, 2, "-r", NULL, CB_EX(arg_handle_register_extension, silent), ba);
	BLI_argsAdd(ba, 2, NULL, "--no-native-pixels", CB(arg_handle_native_pixels_set), ba);

	/* third pass: disabling things and forcing settings */
	BLI_argsAddCase(ba, 3, "-noaudio", 1, NULL, 0, CB(arg_handle_audio_disable), NULL);
	BLI_argsAddCase(ba, 3, "-setaudio", 1, NULL, 0, CB(arg_handle_audio_set), NULL);

	/* fourth pass: processing arguments */
	BLI_argsAdd(ba, 4, "-f", "--render-frame", CB(arg_handle_render_frame), C);
	BLI_argsAdd(ba, 4, "-a", "--render-anim", CB(arg_handle_render_animation), C);
	BLI_argsAdd(ba, 4, "-S", "--scene", CB(arg_handle_scene_set), C);
	BLI_argsAdd(ba, 4, "-s", "--frame-start", CB(arg_handle_frame_start_set), C);
	BLI_argsAdd(ba, 4, "-e", "--frame-end", CB(arg_handle_frame_end_set), C);
	BLI_argsAdd(ba, 4, "-j", "--frame-jump", CB(arg_handle_frame_skip_set), C);
	BLI_argsAdd(ba, 4, "-P", "--python", CB(arg_handle_python_file_run), C);
	BLI_argsAdd(ba, 4, NULL, "--python-text", CB(arg_handle_python_text_run), C);
	BLI_argsAdd(ba, 4, NULL, "--python-expr", CB(arg_handle_python_expr_run), C);
	BLI_argsAdd(ba, 4, NULL, "--python-console", CB(arg_handle_python_console_run), C);
	BLI_argsAdd(ba, 4, NULL, "--python-exit-code", CB(arg_handle_python_exit_code_set), NULL);
	BLI_argsAdd(ba, 4, NULL, "--addons", CB(arg_handle_addons_set), C);

	BLI_argsAdd(ba, 4, "-o", "--render-output", CB(arg_handle_output_set), C);
	BLI_argsAdd(ba, 4, "-E", "--engine", CB(arg_handle_engine_set), C);

	BLI_argsAdd(ba, 4, "-F", "--render-format", CB(arg_handle_image_type_set), C);
	BLI_argsAdd(ba, 1, "-t", "--threads", CB(arg_handle_threads_set), NULL);
	BLI_argsAdd(ba, 4, "-x", "--use-extension", CB(arg_handle_extension_set), C);

#undef CB
#undef CB_EX

}

/**
 * Needs to be added separately.
 */
void main_args_setup_post(bContext *C, bArgs *ba)
{
	BLI_argsParse(ba, 4, arg_handle_load_file, C);
}

/** \} */

#endif /* WITH_PYTHON_MODULE */
